| 菲律宾蛤仔养殖对胶州湾沉积物-水界面生源要素迁移的影响 |
| 摘要点击 2813 全文点击 1568 修订日期：2011-09-22 |
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| 中文关键词 营养盐 沉积物-水界面 生物扰动 菲律宾蛤仔 胶州湾 |
| 英文关键词 nutrient benthic nutrient fluxes bioturbation Ruditapes philippinarum Jiaozhou Bay |
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| 中文摘要 |
| 通过培养实验测定了菲律宾蛤仔 (Ruditapes philippinarum) DIN和PO43-的排泄率和生物扰动作用对胶州湾沉积物-水界面营养盐交换通量的影响,探讨了菲律宾蛤仔养殖对沉积物-水界面生源要素迁移的影响.研究表明,菲律宾蛤仔能够排泄DIN和PO43-,但其生物扰动能够改变沉积物中生物地球化学过程,减少排泄物中的DIN和PO43-向水体释放.在生物扰动作用下,菲律宾蛤仔排泄的DIN和PO43-中,仅有37%(DIN)和34%(PO43--P)最终释放到水体中.在考虑生物扰动作用的影响后,养殖菲律宾蛤仔每年从水体滤除的生源要素中仅有19%的氮和17%的磷以无机营养盐形态完成再生过程返回到水层中,其余部分以渔获量、生物难于利用形态或埋藏的沉积颗粒形态从水层中清除.菲律宾蛤仔生物扰动条件下沉积物向水层释放Si∶N∶P的速率比约为5∶18∶1,其中Si∶N和Si∶P比远低于菲律宾蛤仔从水体中滤除的颗粒物.因此菲律宾蛤仔养殖能够加速生物硅沉积,加剧胶州湾水体中Si限制. |
| 英文摘要 |
| Nutrient excretion rates and the impact of Ruditapes philippinarum on benthic nutrient fluxes were measured by incubation experiments, and these results were used to assess the effect of R. philippinarum aquaculture on nutrient recycling in Jiaozhou bay. Our research indicates that the bioturbation of R. philippinarum would modify biogeochemical progresses in sediment, and restrain nutrients excreted by R. philippinarum releasing to overlying water. Only 37% DIN and 34% PO43--P excreted by R. philippinarum were released to seawater across the sediment-water interface due to bioturbation of R. philippinarum. According to the reduction of nutrient exchange across the sediment-water interface by bioturbation, only 19% (N) and 17% (P) of biogenic elements fed by R. philippinarum can be recycled and returned to seawater, while the others would be removed from seawater in Jiaozhou Bay. The ratios of Si∶N and Si∶P of nutrients released from sediment to seawater with bioturbation of R. philippinarum were about 5∶18 and 5∶1, which were far less than Redfield ratios. Therefore, aquaculture of R. philippinarum should promote BSi biodeposition to sediment and reduce the nutrient ratios of Si∶N and Si∶P in seawater of Jiaozhou bay. |
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